Examples of various string manipulation to allow more complex use cases in buildgraph, and more code reuse

BuildGraphStringTests.xml

<?xml version='1.0' ?>
<BuildGraph xmlns="http://www.epicgames.com/BuildGraph" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.epicgames.com/BuildGraph ../Schema.xsd" >
<Agent Name="TestAgent"  Type="Default">
  <Node Name="TestContains">
    <Property Name="TestString" Value="This is a string to test against" />
    <Property Name="TestString2" Value="Another string" />
	<Property Name="CheckValue" Value="test" />
    <Warning If="Contains('$(TestString)', '$(CheckValue)')" Message="TestContains: Test String contained the check value" />
    <Warning If="!Contains('$(TestString2)', '$(CheckValue)')" Message="TestContains: Test String 2 did not contain the check value" />
  </Node>

  <Node Name="TestStringReplace">
    <Property Name="TestString" Value="This is a string to test against" />
    <StringOp Input="$(TestString)" Method="Replace" Arguments="to test against;which we replaced" Output="TestResult" />
    <Warning Message="TestStringReplace: $(TestResult)" />
  </Node>

  <Node Name="TestStringPrefixPostfix">
    <Property Name="CompileClient" Value="true" />
    <Property Name="CompileServer" Value="true" />
    <Property Name="ClientPlatforms" Value="Win64"/>
    <Property Name="ServerPlatforms" Value="Win64;Linux"/>

    <!-- Build a combined list for client & server, with prefixes to disambiguate. -->
    <Property Name="QualifiedPlatforms" Value="" />
    <ForEach Name="ClientPlatform" Values="$(ClientPlatforms)" If="$(CompileClient)">
    <Property Name="QualifiedPlatforms" Value="$(QualifiedPlatforms);Client.$(ClientPlatform)" />
    </ForEach>
    <ForEach Name="ServerPlatform" Values="$(ServerPlatforms)" If="$(CompileServer)">
    <Property Name="QualifiedPlatforms" Value="$(QualifiedPlatforms);Server.$(ServerPlatform)" />
    </ForEach>

    <ForEach Name="QualifiedPlatform" Values="$(QualifiedPlatforms)">
        <!-- Separate the target platform from the platform type (client/server) -->
        <StringOp Input="$(QualifiedPlatform)" Method="SplitFirst" Arguments="." Output="PlatformType" />
        <StringOp Input="$(QualifiedPlatform)" Method="SplitLast" Arguments="." Output="Platform" />
        <Property Name="TargetName" Value="" />
        <Property Name="TargetName" Value="GameClient" If="'$(PlatformType)'=='Client'" />
        <Property Name="TargetName" Value="GameServer" If="'$(PlatformType)'=='Server'" />
        <Error If="'$(TargetName)'==''" Message="TestStringPrefixPostfix: Failed to determine Platform target type for '$(QualifiedPlatform)'. Got '$(PlatformType)'." />
        <Warning Message="TestStringPrefixPostfix: $(QualifiedPlatform) gave $(PlatformType) and $(Platform) to determine use of $(TargetName)" />
    </ForEach>
  </Node>

</Agent>

<Aggregate Name="TestAll" Requires="TestContains;TestStringReplace;TestStringPrefixPostfix" />

</BuildGraph>